134 Mr. Schroeter’s new Observations 
a very minute particle projected , which seemed to be rather sepa- 
rated from the rest of the enlightened part. 
At 8 h 2', the air being clear , a projecting inequality shewed it- 
self with certainty at the southern horn , as is represented in fig. 7, 
(Tab. XIII.) ath. It was found the same with 288 of the 13-feet. 
As our own atmosphere was then very clear, that of Venus 
also seemed to be purer than usual ; for with both reflectors, 
and particularly with the 13-feet, Dr. Chladni, as well as my- 
self, enjoyed a magnificent view of the arch of illumination, 
which seldom presents itself so well to the eye, the image being 
uncommonly clear and distinct. To both of us the boundary of il- 
lumination, toward which the light became very dim , appeared 
(be it ever so much contradicted) not only nebulous, and not . 
sharply terminated, though sensibly sharper than usual, but also 
very evidently unequal and rugged, with f amt shades between, as 
I have often seen it, but never so plainly. In truth, the ap- 
pearance, as each declared, was very like the image of the 
moon at the time of her quadratures, only that the boundary of 
light was sensibly less sharp, and the faint shadows between 
were not almost black, but in some measure like the dark spots 
of the moon's surface, grey, yet darker than the other parts. 
This instructive observation remains still before my eyes. So 
delicate a picture of nature cannot well be drawn, however we 
both made cursory delineations of it, from which fig. 7. is co- 
pied : but at the boundary of light, soft grey shadows must be 
imagined, traced into the interstices at a, b, c, d, e,f, g. 
March 11th, from & 10' to 45', p.m. the weather having 
cleared up after snow, I found no striking difference of the horns, 
with powers of 209, 288, and 370, and a distinct image ; how- 
ever, the southern appeared rather less pointed, which was 
